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<strong>Tornado</strong> 2.0 User’s Guide sysHwInit( )routine. Once sysHwInit()is working properly, you no longer need to start the agent before the kernel. ! CAUTION: If you are using the NetROM connection, and the agent is started before the kernel, then the agent cannot spawn the NetROM polling task to check periodically for incoming packets from the host. As a result there is no way for the host to get the agent’s attention until a breakpoint occurs. On the other hand, there is no good reason to do so: you can set breakpoints in usrRoot( ) to verify that VxWorks can get through this routine. Once this routine is working, you can start the agent after the kernel (that is, within the usrRoot( ) routine), after which the polling task is spawned normally. ! WARNING: If you are using the serial connection, take care that your serial driver does not cause a stray interrupt when the kernel is started, because the serialdriver interrupt handlers are not installed until after usrRoot( )begins executing: the calling sequence is usrRoot( )➠ sysClkConnect( )➠ sysHwInit2( )➠ intConnect( ). You may want to modify the driver so that it does not set a channel to interrupt mode until the hardware is initialized. This can be done by setting a flag in the BSP after serial interrupts are connected. 4.7 Configuring and Building a VxWorks Boot Program The default boot image included with <strong>Tornado</strong> for your BSP is configured for a networked development environment. The boot image consists of a minimal VxWorks configuration and a boot loader mechanism. You need to configure and build a new boot program (and install it on your boot medium) if you: ■ ■ ■ Are working with a target that is not on a network. Do not have a target with NVRAM, and do not want to enter boot parameters at the target console each time it boots. Want to use an alternate boot process, such as booting over the Target Server File System (TSFS). ! WARNING: Configuration of boot programs is handled independently of the project facility. However, any changes you make to config.h may be absorbed by your projects unless they are masked by project facility selections (see page 92). 144
4 Projects Configuring Boot Parameters To customize a boot program for your development environment, you must edit $WIND_BASE/target/config/bspname/config.h (the configuration file for your BSP). The file contains the definition of DEFAULT_BOOT_LINE, which includes parameters identifying the boot device, IP addresses of host and target, the path and name of the VxWorks image to be loaded, and so on. For information about the boot line parameters defined by DEFAULT_BOOT_LINE, see 2.6.4 Description of Boot Parameters, p.48 and Help>Manuals contents>VxWorks Reference Manual>Libraries>bootLib. 4 Building a Boot Image To build the new boot program, select Build>Build Boot ROM from the Workspace window. Select the BSP for which you want to build the boot program and the type of boot image in the Build Boot ROM dialog box (Figure 4-48). Then click OK. Figure 4-48 Build Boot ROM The three main options for a boot images are: bootrom A compressed boot image. bootrom_uncmp An uncompressed boot image. bootrom_res A ROM-resident boot image. The .hex options are variants of the main options, with Motorola S-Record output. 145
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C Tornado Tools Reference EXAMPLE R
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D Utilities Reference aoutToBin - e
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E X Resources E.1 Predefined X Reso
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Index Symbols ? (C/Tcl interpreter
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Index creating 100 linking 103 open
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